Where is North?

Macmillan, Susan; Shanahan, Tom. 2010 Where is North? Planet Earth, Autumn. 16-17.

Before downloading, please read NORA policies.

Preview

Text
aut10-north.pdf
Download (1MB)

Official URL: http://planetearth.nerc.ac.uk/

Abstract/Summary

To find your way using a magnetic compass with a map, you need to know the difference between magnetic north and map north. This difference is called ‘grid magnetic angle’, and in the UK it is derived from a model of the Earth’s magnetic field, which is updated every year. The variation To go north, you just follow your compass towards magnetic north, right? Not quite. Geophysicists have to work hard so we can continue to navigate with map and compass. Susan Macmillan and Tom Shanahan describe how the UK magnetic repeat station network helps. in grid magnetic angle reflects changes in the Earth’s magnetic field arising from sources in the Earth’s fluid outer core. We don’t yet understand these changes well enough to make good forecasts, so we need to monitor them continuously.

Item Type:	Publication - Article
Programmes:	BGS Programmes 2010 > Earth hazards and systems
ISSN:	1479-2605
NORA Subject Terms:	Earth Sciences
Date made live:	19 Jul 2011 15:24 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/14745

Item Type:

Publication - Article

Programmes:

BGS Programmes 2010 > Earth hazards and systems

ISSN:

1479-2605

NORA Subject Terms:

Earth Sciences

Date made live:

19 Jul 2011 15:24 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/14745